html,body{
    width: 100%;
    height: 100%;
    line-height: 1;
    font-size: 16px;
    color: #000;
    position: relative;
    font-family: "Microsoft YaHei","微软雅黑","Microsoft JhengHei","华文细黑",".PingFangSC";
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a{
    outline: none;
    text-decoration:none;
}
.clearfix:before,
.clearfix:after{
    display:block;
    height:0;
	content:"";
	clear:both;
	visibility:hidden;
}
.container{
    max-width: 1100px;
    height: 100%;
    margin: 0 auto;
}
.page{
    width: 100%;
    height: 100%;
}

.right{
    float: right;
}
.left{
    float: left;
}

/* page one */
.page-one{
    background: url("./../images/bg.png") no-repeat left top;
    background-size: cover;
    color: #fff;
    position: relative;
}
.top-nav{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    line-height: 70px;
    background: rgba(0, 0, 0, .5);
    z-index: 999;
}
.logo{
    display: inline-block;
    width: 150px;
    height: 70px;
    font-size: 22px;
    background: url("./../images/logo.png") no-repeat left center;
}
.nav{
    font-size: 0px;
    height: 70px;
    line-height: 70px;
}
.nav a{
    font-size: 16px;
    display: inline-block;
    width: 120px;
    height: 40px;
    background: #ff6700;
    border-radius: 5px;
    text-align: center;
    line-height: 40px;
    margin-right: 10px;
    color: #fff;
    vertical-align: middle;
}
.nav a:last-child{
    margin-right: 0;
}
.desc{
    position: absolute;
    top: 28%;
    left: 0;
    right: 0;
    text-align: center;
    color: #fff;
    padding: 0 44px;
    line-height: 26px;
    letter-spacing: 5px;
}
.desc h1{
    font-size: 46px;
    margin: 0;
    padding: 0;
    font-weight: 300;
    margin-bottom: 50px;
}
.desc h3{
    font-size: 30px;
    font-weight: 100;
    margin-bottom: 50px;
    letter-spacing: 0px;
}
.desc h5{
    font-size: 20px;
    font-weight: 100;
    letter-spacing: 0px;
}
.play-btn{
    position: absolute;
    top: 60%;
    left: 0;
    bottom: 0;
    width: 100%;
    text-align: center;
    font-size: 0;
}
.play-btn span{
    display: inline-block;   
    width: 114px;
    height: 114px;
    background: url("./../images/paly-btn.png") no-repeat left top;
    background-size: 100%;
    cursor: pointer;
    animation: breathe 2s linear 0s infinite;
    opacity: 0.8;
}
@keyframes breathe{
    0%{
        transform: scale(0.8);
    }
    50%{
        transform: scale(1);
    }
    100%{
        transform: scale(0.8);
    }
}
.arrow-bot{
    position: absolute;
    bottom: 4.5%;
    left: 0;
    right: 0;
    text-align: center;
    animation: slideDown 2s linear 0s infinite;
}
.arrow{
    display: inline-block;
    position: absolute;
    width: 36px;
    height: 12px;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    background: url("./../images/drop-down_arrow.png") no-repeat left top;
}
@keyframes slideDown{
    0%, 100% {
        bottom: 4.5%；
    }
    70% {
        bottom: 2%;
    }
}
/* page one end */